"Thanks Ian! I got in touch with the people from Backyard brains to check if the Spiker for plants was suitable, they rather doubt the device can take reading from the slime (electric potentials between -10 to 15 mV in periods of 40 min). They said…"
"Thanks a lot for your reply Ian and all three references. This plant spiker set is interesting, it seems more DIY than the E. Braund and E. Miranda experimentation. Good luck with the spiker set on slime! "